Police Chief Allen Krajcik told The Enterprise that state police are investigating the Friday morning crash that killed Alexandra Hamilton to avoid any conflict of interest.

Hamilton, a 2009 graduate of Oliver Ames High School, died after her 2003 Dodge Stratus struck a fuel truck near 380 Turnpike St. at 1 a.m.

A preliminary investigation found that Hamilton, traveling north on Route 138, crossed the center line and entered the southbound lane of a fuel truck driven by Robert Harris of Taunton, Krajcik said. The truck is owned by Diesel Direct of Stoughton.

Harris, the truck driver, steered to the right to try and avoid a collision, Krajcik said. Hamilton’s Stratus struck the left side of the truck behind the cab, he said.

Authorities are trying to determine why Hamilton veered into the truck’s lane.

“The truck driver does deserve credit for taking evasive action to avoid a head-on (collision) as it appears the Hamilton vehicle was in his lane,” Krajcik told The Enterprise. “We’re trying to determine how that came about, the reason for that,” he said.

The crash report was unavailable on Sunday. Krajcik said the report would be done by a state police reconstruction team, and that the state police investigation may take up to two months.